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All Journal International Journal of Innovation in Mechanical Engineering and Advanced Materials Blueprint Journal
Rande, Thadeus
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Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Utilization of Plastic Waste and Rice Husk Ash in Polyethylene-Based Composites for Ceiling Applications Wangge, Gusti F. X. Wara; Servianus, Yohanes Viva; Rande, Thadeus
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol 7, No 3 (2025)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v7i3.36658

Abstract

This study aims to analyze the effect of polyethylene (PE) and rice husk ash (RHA) composition variations on the mechanical properties of recycled composites developed as environmentally friendly ceiling materials. Composite specimens were prepared through a systematic process involving shredding PE plastic waste into 3–5 mm particles, burning rice husks at 600–700 °C followed by sieving through a 200-mesh screen, melting the plastic at 160–170 °C, and mixing with RHA at three composition ratios: 80:20, 70:30, and 60:40 (PE:RHA). The mixtures were molded into 50 × 50 mm specimens and tested in accordance with ASTM D695 for compressive properties and ASTM D792 for density. The results show that composition variation significantly influences compressive strength, elastic modulus, and strain behavior. The 80:20 composition exhibited the highest elasticity, with a compressive strength of 15.59 MPa and an elastic modulus of 463.50 MPa; however, it fractured shortly after exceeding the elastic limit. The 60:40 composition achieved the highest compressive strength of 125 MPa with a strain of 56.6%, but showed brittle behavior due to its very low elastic modulus (7.5 MPa). The 70:30 composition demonstrated the most balanced mechanical performance, with a compressive strength of 61.65 MPa, a strain of 18.20%, and stable ductile behavior. Based on the overall mechanical performance, the 70:30 PE–RHA composition is recommended as the optimal formulation, as it provides the best balance between strength, stiffness, and deformation resistance. This composition is therefore considered the most suitable for non-structural ceiling applications requiring lightweight, mechanically stable, and environmentally sustainable materials.
ANALISIS PENGARUH PENERAPAN PRINSIP ERGONOMI PADA MOTOR CHOPPER DARI STANG HINGGA JOK: ANALYSIS OF THE EFFECT OF ERGONOMICS PRINCIPLE APPLICATION ON CHOPPER MOTORCYCLES FROM HANDLEBARS TO SEAT wara, gusti; F.X.Wara Wangge, Gusti; Rande, Thadeus; Yosep Boli Odung, Bernadus
Blueprint Journal Vol 2 No 1 (2026): Februari : Blueprint Journal
Publisher : PT Yupin Felicitas Utama

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Abstract

This study evaluated the suitability of chopper motorcycle designs to the anthropometrics of 40 male users aged 20–25 at Cristo Re Polytechnic. Measurements of five body parameters showed high variation in size, and all variables were found to be non-normally distributed based on the Shapiro–Wilk test (p < 0.05). Ergonomic analysis revealed that several motorcycle dimensions did not match the body characteristics of the majority of users. The 110 cm handlebar height was 15 cm below the actual hand reach height (125 cm), causing shoulder elevation and increasing static load. The 70 cm handlebar-seat distance also exceeded the ideal reach (62 cm), forcing the rider to lean forward, increasing shoulder and back muscle tension. Furthermore, the footrest, positioned far forward, overextended the legs and increased pressure on the hips and lower back. These findings indicate an increased risk of fatigue and musculoskeletal disorders. Design recommendations include raising the handlebars to 130–135 cm, reducing the handlebar-seat distance to approximately 62 cm, and lowering the footrest by 5–10 cm with an increase of approximately 3 cm in height to achieve a more ergonomic riding posture. 
Co-Authors Servianus, Yohanes Viva Wangge, Gusti F.X. Wara wara, gusti Yosep Boli Odung, Bernadus